Anti theft motion alarm

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http://androidforums.com – I have a Samsung Galaxy S3 and would like to download an anti theft motion alarm that stays activated when the screen is locked an off. I have tried a number of apps, but so far all stop working when the screen is locked; you must first press the home key button before the alarm sounds. Not helpful when you work in a school of 650 plus students and things of value seem grow legs. Any ideas (General)